Hydroturbine pump



June 24, 1930.

I. c. JENNINGS HYDROTURBINE PUMP Filed June 11, 1928 2 Sheets-Sheet lgmmkw June 24, 1930. 1 I c. JENNINGS 2 HYDROTURBINE PUMP Filed Jun'e 11,1928 2 Sheets-Sheet 2 GUT $2 1, v WW Patented June 24, 1930 PATENT oIRVING C. JENNINGS, OF SOUTH NORWALK, CONNECTICUT HYDROTURBINE PUMPApplication filed June 11,

The object of this invention is to improve the construction of thewell-known Nash hydro-turbine pump, shown and described in LettersPatents granted to Lewis H.

Nash, No. 953,222, March 29, 1910, and No.

1,091,529, granted March 31, 1914.

This Nash pump comprises an eccentric casing in which is arranged acircular rotor having a series of displacement chambers.

A liquid is placed inthe pump casing and the rotor is driven at highspeed. The .liquid in 'the casing ,will travel around with the rotor andby centrifugal action will follow the outline of the casing. By thisarrangement, the liquid will be forced. into and out of the displacementchainbers as the rotor turns. Suitable ports are provided so that thepiston action of the liquid thus obtained can be utilized either toexhaust or compress a fluid.

In the patent to Nash, No. 953,222, the rotor is provided with holes orports extending from the bottom of the displacement chambersto'cooperate with holes or ports formed in a hub or hubs on the pumpcasing on which the rotor turns. This arrangement is advantageous inthat nearly all the displacement chamber capacity can be used forpumping, but it is disadvantageous in that it is difiicult to maintain atight fit between the rotor and the hub or hubs even if the same aremade large in diameter.

' In the patent to Nash, No. 1,091,529, the rotor is provided with alarge hollow hub from which the displacement chambers extend, and oneset of inlet ports and two sets of outlet ports are arranged laterallywith respect to the displacement chambers.

This arrangement is an improvement in that the ports can be kept tight,but is a disadvantage because a large hub has to be used which cuts downthe capacity of the pump and the port arrangement does not exactlybalance the rotor.

In patent granted to me March 18, 1919, No. 1,297,692, I have improvedthe structure by arranging the ports entirely at one side of the rotorand by providing means by which the rotor can be adjusted bodily 50towards the ported end of the casing to take 1928. Serial No. 284,325.

up wear. This structure, however, has the disadvantage that the portsare on one side of the rotor, and the full capacity of the rotor is notutilized by reason ofthe hollow hub construction;

In all of these prior StJ'HC-tUIOS, it will be noticed that the hubtakes 11 p more than onehalf the diameter of the rotor, which cuts downthe capacity of the pump.

The object of this improvement is to provide a pump of the classspecified, in which all the advantages heretofore enumerated areretained and the disadvantages obviated.

To this end, the improvement consists in uslng a small solid hub fromwhich the vanes which form the displacement chambers extend, and whichwings or vanes are made long as compared with the radius of the hub, thehub occupying less than half the diameter of the rotor. Thisconstruction enables me to increase the capacity of the pump for a givendiameter of the rotor and at the same time enables me to obtain a tight,balanced port construction.

Owing to the greater depth of the liquid in the displacement chambers,an increased efiiciency is obtained because there is less chance for theair to pass from chamber to chamber around the periphery of the blades.It will also be noted that this relatively great depth of water in thedisplacement chambers allows the pump to work with less turbulence sothat a smoother surface of liquid will be presented to the air as apiston in each displacement chamber and less air will be carried aroundfrom the outlet to the inlet in the form of foam or bubbles in thewater. In other words, by having more liquid in the wheel in deeper cmbers, more liquid can be allowed to go out into the case withoutunsealing the ends of the blades which makes a better seal at the samecapacity. This improvement enables me to work the pump to obtain higherpressures than was possible with the preceding structures.

The improvement is illustratcd in the accompanying two sheets ofdrawings, in which Figure 1 is a cross-sectional elevation taken on theline 1 1 of Fig. 2;

Fig. 2 is a cross-sectional elevation taken on line 2-2 of Fig. 1;

Fig. 3 is a cross-sectional elevation taken on line 33 of Fig. 1; and

Fig. 4 is a cross-sectional elevation taken on line 4-4 of Fig. 1.

Referring to the drawings and in detail, A designates the pump casing.The inside of the casing is eccentric in shape or outline. The pumpcasing is closed or sealed by a head or auxiliary casing B. G designatesthe circular rotor. This rotor is arranged in the eccentric casing asshown and described in my Patent N 0. 1,297,692, so that two pumpingactions will be obtained for each revolution of the rotor.

The rotor comprises a small solid hub 10, which is keyed to the drivingshaft D. Shrouds or plates 1111, extend from the hub and curved vanes 12are arranged between the shrouds so that the rotor will be provided witha series of radially extending displacement chambers. Holes or ports 13are cut or formed through both shrouds 11-11 in circular lines close tothe central hub to provide for the entrance and exit of the fluid to bepumped into and out of the displacement chambers.

It will be noticed that the depth of each displacement chamber is muchgreater than the radius of the hub. The proportion illustrated in thedrawing is intended to 100 represent a construction in which the ratiois about 3 to 1. Or, putting it in another way, the hub takes up 27 percent. of the wheel diameter, leaving 73 per cent. employed for thebuckets or displacement 105 chambers.

E designates the entrance or inlet passage into the casing. That part ofthe casing at the left of the rotor in Fig. 1 is divided by a partitionP, (Fig. 3) so that a hollow comllopartment F will be formed into whichthe passage E leads.

The auxiliary casing or head B is divided by a partition P so as to havea compartment F, and the two compartments F and 115 F are connected by across-passage F Two inlet ports G-G are formed in the side wall of thecompartment F and matching inlet ports (PH-G are formed in the side wallof the head B.

120 H designates the outlet or exit from the casing. This outlet extendsfrom the compartment I, also formed in the casing A, by the partition P.A matching compartment I is formed in the head B by the par- 195 titionP and the compartments I and I are connected by a cross-passage I Outletports JJ are formed in the side wall of the compartment I and matchingoutlet ports J'J' are formed in the side 130 wall of the compartment I.

It will thus be seen that there are two pair of matching inlet ports andtwo pair of matching outlet ports arranged at the sides of the rotor.This Will balance the rotor both against the pull due to the suctioncreated thereby and to the thrust created thereby. The rotor can bearranged to have only a single pumping action for each revolution, asshown, for example, in Patent No. 1,091,529, and with this arrangementonly one pair of matching inlet and onedpair of matching outlet portswould be use From the previous description, it will be noticed that myimprovement allows me to employ a great proportion of the rotor spacefor the pumping action and also enables me to use the balanced portconstruction.

Italso will be noted that by reason of the greater depth of Water in thedisplacement chambers, greater efiiciency is obtained as previouslyexplained.

By the arrangements described, the pumping volume is increased and avery nicely balanced action is obtained 011 the rotor.

The details and arrangements herein shown and described may be greatlyvaried by a skilled mechanic without departing from the spirit of theinvention.

Having thus fully described my invention, what I desire to claim byUnited States Letters Patent is 1. In a hydro-turbine pump, thecombination of an eccentric casing, a circular rotor fitted therein,said rotor comprising a hub and vanes or Wings extending therefrom toform displacement chambers, the depth of each displacement chamber beinggreater than the radius of the hub, and ports on each side of the rotorlocated adjacent the rotor hub.

j 2. In a hydro-turbine pump, the combination of an eccentric casing, acircular rotor fitted therein, said rotor comprising a small hub andwings or vanes extending therefrom to form displacement chambers, thehub occupying less than half the diameter of the rotor, and ports oneach side of the rotor located adjacent the rotor hub.

3. In a hydro-turbine pump, the combination of an eccentric casing, acircular rotor fitted therein, comprising a solid hub, vanes let port oneach side of the rotor, and inlet and outlet passages connected withsaid ports.

5. In a hydro-turbine pump, the combination of an eccentric casing, acircular rotor fitted therein, comprising a solid hub, shrouds extendingfrom said hub and vanes extending from said hub between said shrouds toform displacement chambers, the hub diameter being less than one-half ofthe rotor diameter, holes extending through said shrouds at the innerends of said chambers, and inlet and outlet ports arranged sidewise ofthe rotor.

6. In a hydro-turbine pump, the combinati'on of an eccentric casing, acircular rotor fitted therein, comprising a solid hub, shrouds extendingfrom said hub, vanes extending from said hub between said shrouds toform displacement chambers, the hub diameter being less than one-half ofthe rotor diameter, holes extending through said shrouds at the innerends of said chambers and two pair of inlet ports and two pair of outletports arranged sidewise of the rotors.

In testimony whereof I have hereunto affixed my signature.

IRVING G. JENNINGS.

